1 /* 2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/classLoader.hpp" 27 #include "classfile/classLoaderData.hpp" 28 #include "classfile/javaClasses.hpp" 29 #include "classfile/stringTable.hpp" 30 #include "classfile/systemDictionary.hpp" 31 #include "classfile/vmSymbols.hpp" 32 #include "code/codeCache.hpp" 33 #include "code/dependencies.hpp" 34 #include "gc/shared/cardTableModRefBS.hpp" 35 #include "gc/shared/collectedHeap.inline.hpp" 36 #include "gc/shared/gcLocker.inline.hpp" 37 #include "gc/shared/genCollectedHeap.hpp" 38 #include "gc/shared/generation.hpp" 39 #include "gc/shared/space.hpp" 40 #include "interpreter/interpreter.hpp" 41 #include "memory/filemap.hpp" 42 #include "memory/metadataFactory.hpp" 43 #include "memory/metaspaceShared.hpp" 44 #include "memory/oopFactory.hpp" 45 #include "memory/universe.hpp" 46 #include "memory/universe.inline.hpp" 47 #include "oops/constantPool.hpp" 48 #include "oops/instanceClassLoaderKlass.hpp" 49 #include "oops/instanceKlass.hpp" 50 #include "oops/instanceMirrorKlass.hpp" 51 #include "oops/instanceRefKlass.hpp" 52 #include "oops/objArrayOop.inline.hpp" 53 #include "oops/oop.inline.hpp" 54 #include "oops/typeArrayKlass.hpp" 55 #include "prims/jvmtiRedefineClassesTrace.hpp" 56 #include "runtime/arguments.hpp" 57 #include "runtime/atomic.inline.hpp" 58 #include "runtime/commandLineFlagConstraintList.hpp" 59 #include "runtime/deoptimization.hpp" 60 #include "runtime/fprofiler.hpp" 61 #include "runtime/handles.inline.hpp" 62 #include "runtime/init.hpp" 63 #include "runtime/java.hpp" 64 #include "runtime/javaCalls.hpp" 65 #include "runtime/sharedRuntime.hpp" 66 #include "runtime/synchronizer.hpp" 67 #include "runtime/thread.inline.hpp" 68 #include "runtime/timer.hpp" 69 #include "runtime/vm_operations.hpp" 70 #include "services/memoryService.hpp" 71 #include "utilities/copy.hpp" 72 #include "utilities/events.hpp" 73 #include "utilities/hashtable.inline.hpp" 74 #include "utilities/macros.hpp" 75 #include "utilities/preserveException.hpp" 76 #if INCLUDE_ALL_GCS 77 #include "gc/cms/cmsCollectorPolicy.hpp" 78 #include "gc/g1/g1CollectedHeap.inline.hpp" 79 #include "gc/g1/g1CollectorPolicy.hpp" 80 #include "gc/parallel/parallelScavengeHeap.hpp" 81 #include "gc/shared/adaptiveSizePolicy.hpp" 82 #endif // INCLUDE_ALL_GCS 83 #if INCLUDE_CDS 84 #include "classfile/sharedClassUtil.hpp" 85 #endif 86 87 // Known objects 88 Klass* Universe::_boolArrayKlassObj = NULL; 89 Klass* Universe::_byteArrayKlassObj = NULL; 90 Klass* Universe::_charArrayKlassObj = NULL; 91 Klass* Universe::_intArrayKlassObj = NULL; 92 Klass* Universe::_shortArrayKlassObj = NULL; 93 Klass* Universe::_longArrayKlassObj = NULL; 94 Klass* Universe::_singleArrayKlassObj = NULL; 95 Klass* Universe::_doubleArrayKlassObj = NULL; 96 Klass* Universe::_typeArrayKlassObjs[T_VOID+1] = { NULL /*, NULL...*/ }; 97 Klass* Universe::_objectArrayKlassObj = NULL; 98 oop Universe::_int_mirror = NULL; 99 oop Universe::_float_mirror = NULL; 100 oop Universe::_double_mirror = NULL; 101 oop Universe::_byte_mirror = NULL; 102 oop Universe::_bool_mirror = NULL; 103 oop Universe::_char_mirror = NULL; 104 oop Universe::_long_mirror = NULL; 105 oop Universe::_short_mirror = NULL; 106 oop Universe::_void_mirror = NULL; 107 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ }; 108 oop Universe::_main_thread_group = NULL; 109 oop Universe::_system_thread_group = NULL; 110 objArrayOop Universe::_the_empty_class_klass_array = NULL; 111 Array<Klass*>* Universe::_the_array_interfaces_array = NULL; 112 oop Universe::_the_null_string = NULL; 113 oop Universe::_the_min_jint_string = NULL; 114 LatestMethodCache* Universe::_finalizer_register_cache = NULL; 115 LatestMethodCache* Universe::_loader_addClass_cache = NULL; 116 LatestMethodCache* Universe::_pd_implies_cache = NULL; 117 LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL; 118 oop Universe::_out_of_memory_error_java_heap = NULL; 119 oop Universe::_out_of_memory_error_metaspace = NULL; 120 oop Universe::_out_of_memory_error_class_metaspace = NULL; 121 oop Universe::_out_of_memory_error_array_size = NULL; 122 oop Universe::_out_of_memory_error_gc_overhead_limit = NULL; 123 oop Universe::_out_of_memory_error_realloc_objects = NULL; 124 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL; 125 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0; 126 bool Universe::_verify_in_progress = false; 127 oop Universe::_null_ptr_exception_instance = NULL; 128 oop Universe::_arithmetic_exception_instance = NULL; 129 oop Universe::_virtual_machine_error_instance = NULL; 130 oop Universe::_vm_exception = NULL; 131 oop Universe::_allocation_context_notification_obj = NULL; 132 133 Array<int>* Universe::_the_empty_int_array = NULL; 134 Array<u2>* Universe::_the_empty_short_array = NULL; 135 Array<Klass*>* Universe::_the_empty_klass_array = NULL; 136 Array<Method*>* Universe::_the_empty_method_array = NULL; 137 138 // These variables are guarded by FullGCALot_lock. 139 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;) 140 debug_only(int Universe::_fullgc_alot_dummy_next = 0;) 141 142 // Heap 143 int Universe::_verify_count = 0; 144 145 // Oop verification (see MacroAssembler::verify_oop) 146 uintptr_t Universe::_verify_oop_mask = 0; 147 uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1; 148 149 int Universe::_base_vtable_size = 0; 150 bool Universe::_bootstrapping = false; 151 bool Universe::_fully_initialized = false; 152 153 size_t Universe::_heap_capacity_at_last_gc; 154 size_t Universe::_heap_used_at_last_gc = 0; 155 156 CollectedHeap* Universe::_collectedHeap = NULL; 157 158 NarrowPtrStruct Universe::_narrow_oop = { NULL, 0, true }; 159 NarrowPtrStruct Universe::_narrow_klass = { NULL, 0, true }; 160 address Universe::_narrow_ptrs_base; 161 162 void Universe::basic_type_classes_do(void f(Klass*)) { 163 f(boolArrayKlassObj()); 164 f(byteArrayKlassObj()); 165 f(charArrayKlassObj()); 166 f(intArrayKlassObj()); 167 f(shortArrayKlassObj()); 168 f(longArrayKlassObj()); 169 f(singleArrayKlassObj()); 170 f(doubleArrayKlassObj()); 171 } 172 173 void Universe::oops_do(OopClosure* f, bool do_all) { 174 175 f->do_oop((oop*) &_int_mirror); 176 f->do_oop((oop*) &_float_mirror); 177 f->do_oop((oop*) &_double_mirror); 178 f->do_oop((oop*) &_byte_mirror); 179 f->do_oop((oop*) &_bool_mirror); 180 f->do_oop((oop*) &_char_mirror); 181 f->do_oop((oop*) &_long_mirror); 182 f->do_oop((oop*) &_short_mirror); 183 f->do_oop((oop*) &_void_mirror); 184 185 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 186 f->do_oop((oop*) &_mirrors[i]); 187 } 188 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking"); 189 190 f->do_oop((oop*)&_the_empty_class_klass_array); 191 f->do_oop((oop*)&_the_null_string); 192 f->do_oop((oop*)&_the_min_jint_string); 193 f->do_oop((oop*)&_out_of_memory_error_java_heap); 194 f->do_oop((oop*)&_out_of_memory_error_metaspace); 195 f->do_oop((oop*)&_out_of_memory_error_class_metaspace); 196 f->do_oop((oop*)&_out_of_memory_error_array_size); 197 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit); 198 f->do_oop((oop*)&_out_of_memory_error_realloc_objects); 199 f->do_oop((oop*)&_preallocated_out_of_memory_error_array); 200 f->do_oop((oop*)&_null_ptr_exception_instance); 201 f->do_oop((oop*)&_arithmetic_exception_instance); 202 f->do_oop((oop*)&_virtual_machine_error_instance); 203 f->do_oop((oop*)&_main_thread_group); 204 f->do_oop((oop*)&_system_thread_group); 205 f->do_oop((oop*)&_vm_exception); 206 f->do_oop((oop*)&_allocation_context_notification_obj); 207 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);) 208 } 209 210 // Serialize metadata in and out of CDS archive, not oops. 211 void Universe::serialize(SerializeClosure* f, bool do_all) { 212 213 f->do_ptr((void**)&_boolArrayKlassObj); 214 f->do_ptr((void**)&_byteArrayKlassObj); 215 f->do_ptr((void**)&_charArrayKlassObj); 216 f->do_ptr((void**)&_intArrayKlassObj); 217 f->do_ptr((void**)&_shortArrayKlassObj); 218 f->do_ptr((void**)&_longArrayKlassObj); 219 f->do_ptr((void**)&_singleArrayKlassObj); 220 f->do_ptr((void**)&_doubleArrayKlassObj); 221 f->do_ptr((void**)&_objectArrayKlassObj); 222 223 { 224 for (int i = 0; i < T_VOID+1; i++) { 225 if (_typeArrayKlassObjs[i] != NULL) { 226 assert(i >= T_BOOLEAN, "checking"); 227 f->do_ptr((void**)&_typeArrayKlassObjs[i]); 228 } else if (do_all) { 229 f->do_ptr((void**)&_typeArrayKlassObjs[i]); 230 } 231 } 232 } 233 234 f->do_ptr((void**)&_the_array_interfaces_array); 235 f->do_ptr((void**)&_the_empty_int_array); 236 f->do_ptr((void**)&_the_empty_short_array); 237 f->do_ptr((void**)&_the_empty_method_array); 238 f->do_ptr((void**)&_the_empty_klass_array); 239 _finalizer_register_cache->serialize(f); 240 _loader_addClass_cache->serialize(f); 241 _pd_implies_cache->serialize(f); 242 _throw_illegal_access_error_cache->serialize(f); 243 } 244 245 void Universe::check_alignment(uintx size, uintx alignment, const char* name) { 246 if (size < alignment || size % alignment != 0) { 247 vm_exit_during_initialization( 248 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment)); 249 } 250 } 251 252 void initialize_basic_type_klass(Klass* k, TRAPS) { 253 Klass* ok = SystemDictionary::Object_klass(); 254 if (UseSharedSpaces) { 255 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 256 assert(k->super() == ok, "u3"); 257 k->restore_unshareable_info(loader_data, Handle(), CHECK); 258 } else { 259 k->initialize_supers(ok, CHECK); 260 } 261 k->append_to_sibling_list(); 262 } 263 264 void Universe::genesis(TRAPS) { 265 ResourceMark rm; 266 267 { FlagSetting fs(_bootstrapping, true); 268 269 { MutexLocker mc(Compile_lock); 270 271 // determine base vtable size; without that we cannot create the array klasses 272 compute_base_vtable_size(); 273 274 if (!UseSharedSpaces) { 275 _boolArrayKlassObj = TypeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK); 276 _charArrayKlassObj = TypeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK); 277 _singleArrayKlassObj = TypeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK); 278 _doubleArrayKlassObj = TypeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK); 279 _byteArrayKlassObj = TypeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK); 280 _shortArrayKlassObj = TypeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK); 281 _intArrayKlassObj = TypeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK); 282 _longArrayKlassObj = TypeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK); 283 284 _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj; 285 _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj; 286 _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj; 287 _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj; 288 _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj; 289 _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj; 290 _typeArrayKlassObjs[T_INT] = _intArrayKlassObj; 291 _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj; 292 293 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); 294 295 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK); 296 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK); 297 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK); 298 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK); 299 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK); 300 } 301 } 302 303 vmSymbols::initialize(CHECK); 304 305 SystemDictionary::initialize(CHECK); 306 307 Klass* ok = SystemDictionary::Object_klass(); 308 309 _the_null_string = StringTable::intern("null", CHECK); 310 _the_min_jint_string = StringTable::intern("-2147483648", CHECK); 311 312 if (UseSharedSpaces) { 313 // Verify shared interfaces array. 314 assert(_the_array_interfaces_array->at(0) == 315 SystemDictionary::Cloneable_klass(), "u3"); 316 assert(_the_array_interfaces_array->at(1) == 317 SystemDictionary::Serializable_klass(), "u3"); 318 MetaspaceShared::fixup_shared_string_regions(); 319 } else { 320 // Set up shared interfaces array. (Do this before supers are set up.) 321 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass()); 322 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass()); 323 } 324 325 initialize_basic_type_klass(boolArrayKlassObj(), CHECK); 326 initialize_basic_type_klass(charArrayKlassObj(), CHECK); 327 initialize_basic_type_klass(singleArrayKlassObj(), CHECK); 328 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK); 329 initialize_basic_type_klass(byteArrayKlassObj(), CHECK); 330 initialize_basic_type_klass(shortArrayKlassObj(), CHECK); 331 initialize_basic_type_klass(intArrayKlassObj(), CHECK); 332 initialize_basic_type_klass(longArrayKlassObj(), CHECK); 333 } // end of core bootstrapping 334 335 // Maybe this could be lifted up now that object array can be initialized 336 // during the bootstrapping. 337 338 // OLD 339 // Initialize _objectArrayKlass after core bootstraping to make 340 // sure the super class is set up properly for _objectArrayKlass. 341 // --- 342 // NEW 343 // Since some of the old system object arrays have been converted to 344 // ordinary object arrays, _objectArrayKlass will be loaded when 345 // SystemDictionary::initialize(CHECK); is run. See the extra check 346 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl. 347 _objectArrayKlassObj = InstanceKlass:: 348 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK); 349 // OLD 350 // Add the class to the class hierarchy manually to make sure that 351 // its vtable is initialized after core bootstrapping is completed. 352 // --- 353 // New 354 // Have already been initialized. 355 _objectArrayKlassObj->append_to_sibling_list(); 356 357 // Compute is_jdk version flags. 358 // Only 1.3 or later has the java.lang.Shutdown class. 359 // Only 1.4 or later has the java.lang.CharSequence interface. 360 // Only 1.5 or later has the java.lang.management.MemoryUsage class. 361 if (JDK_Version::is_partially_initialized()) { 362 uint8_t jdk_version; 363 Klass* k = SystemDictionary::resolve_or_null( 364 vmSymbols::java_lang_management_MemoryUsage(), THREAD); 365 CLEAR_PENDING_EXCEPTION; // ignore exceptions 366 if (k == NULL) { 367 k = SystemDictionary::resolve_or_null( 368 vmSymbols::java_lang_CharSequence(), THREAD); 369 CLEAR_PENDING_EXCEPTION; // ignore exceptions 370 if (k == NULL) { 371 k = SystemDictionary::resolve_or_null( 372 vmSymbols::java_lang_Shutdown(), THREAD); 373 CLEAR_PENDING_EXCEPTION; // ignore exceptions 374 if (k == NULL) { 375 jdk_version = 2; 376 } else { 377 jdk_version = 3; 378 } 379 } else { 380 jdk_version = 4; 381 } 382 } else { 383 jdk_version = 5; 384 } 385 JDK_Version::fully_initialize(jdk_version); 386 } 387 388 #ifdef ASSERT 389 if (FullGCALot) { 390 // Allocate an array of dummy objects. 391 // We'd like these to be at the bottom of the old generation, 392 // so that when we free one and then collect, 393 // (almost) the whole heap moves 394 // and we find out if we actually update all the oops correctly. 395 // But we can't allocate directly in the old generation, 396 // so we allocate wherever, and hope that the first collection 397 // moves these objects to the bottom of the old generation. 398 // We can allocate directly in the permanent generation, so we do. 399 int size; 400 if (UseConcMarkSweepGC) { 401 warning("Using +FullGCALot with concurrent mark sweep gc " 402 "will not force all objects to relocate"); 403 size = FullGCALotDummies; 404 } else { 405 size = FullGCALotDummies * 2; 406 } 407 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK); 408 objArrayHandle dummy_array(THREAD, naked_array); 409 int i = 0; 410 while (i < size) { 411 // Allocate dummy in old generation 412 oop dummy = InstanceKlass::cast(SystemDictionary::Object_klass())->allocate_instance(CHECK); 413 dummy_array->obj_at_put(i++, dummy); 414 } 415 { 416 // Only modify the global variable inside the mutex. 417 // If we had a race to here, the other dummy_array instances 418 // and their elements just get dropped on the floor, which is fine. 419 MutexLocker ml(FullGCALot_lock); 420 if (_fullgc_alot_dummy_array == NULL) { 421 _fullgc_alot_dummy_array = dummy_array(); 422 } 423 } 424 assert(i == _fullgc_alot_dummy_array->length(), "just checking"); 425 } 426 #endif 427 428 // Initialize dependency array for null class loader 429 ClassLoaderData::the_null_class_loader_data()->init_dependencies(CHECK); 430 431 } 432 433 // CDS support for patching vtables in metadata in the shared archive. 434 // All types inherited from Metadata have vtables, but not types inherited 435 // from MetaspaceObj, because the latter does not have virtual functions. 436 // If the metadata type has a vtable, it cannot be shared in the read-only 437 // section of the CDS archive, because the vtable pointer is patched. 438 static inline void add_vtable(void** list, int* n, void* o, int count) { 439 guarantee((*n) < count, "vtable list too small"); 440 void* vtable = dereference_vptr(o); 441 assert(*(void**)(vtable) != NULL, "invalid vtable"); 442 list[(*n)++] = vtable; 443 } 444 445 void Universe::init_self_patching_vtbl_list(void** list, int count) { 446 int n = 0; 447 { InstanceKlass o; add_vtable(list, &n, &o, count); } 448 { InstanceClassLoaderKlass o; add_vtable(list, &n, &o, count); } 449 { InstanceMirrorKlass o; add_vtable(list, &n, &o, count); } 450 { InstanceRefKlass o; add_vtable(list, &n, &o, count); } 451 { TypeArrayKlass o; add_vtable(list, &n, &o, count); } 452 { ObjArrayKlass o; add_vtable(list, &n, &o, count); } 453 { Method o; add_vtable(list, &n, &o, count); } 454 { ConstantPool o; add_vtable(list, &n, &o, count); } 455 } 456 457 void Universe::initialize_basic_type_mirrors(TRAPS) { 458 assert(_int_mirror==NULL, "basic type mirrors already initialized"); 459 _int_mirror = 460 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK); 461 _float_mirror = 462 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK); 463 _double_mirror = 464 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK); 465 _byte_mirror = 466 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK); 467 _bool_mirror = 468 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK); 469 _char_mirror = 470 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK); 471 _long_mirror = 472 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK); 473 _short_mirror = 474 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK); 475 _void_mirror = 476 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK); 477 478 _mirrors[T_INT] = _int_mirror; 479 _mirrors[T_FLOAT] = _float_mirror; 480 _mirrors[T_DOUBLE] = _double_mirror; 481 _mirrors[T_BYTE] = _byte_mirror; 482 _mirrors[T_BOOLEAN] = _bool_mirror; 483 _mirrors[T_CHAR] = _char_mirror; 484 _mirrors[T_LONG] = _long_mirror; 485 _mirrors[T_SHORT] = _short_mirror; 486 _mirrors[T_VOID] = _void_mirror; 487 //_mirrors[T_OBJECT] = InstanceKlass::cast(_object_klass)->java_mirror(); 488 //_mirrors[T_ARRAY] = InstanceKlass::cast(_object_klass)->java_mirror(); 489 } 490 491 void Universe::fixup_mirrors(TRAPS) { 492 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly, 493 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply 494 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note 495 // that the number of objects allocated at this point is very small. 496 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded"); 497 HandleMark hm(THREAD); 498 // Cache the start of the static fields 499 InstanceMirrorKlass::init_offset_of_static_fields(); 500 501 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list(); 502 int list_length = list->length(); 503 for (int i = 0; i < list_length; i++) { 504 Klass* k = list->at(i); 505 assert(k->is_klass(), "List should only hold classes"); 506 EXCEPTION_MARK; 507 KlassHandle kh(THREAD, k); 508 java_lang_Class::fixup_mirror(kh, CATCH); 509 } 510 delete java_lang_Class::fixup_mirror_list(); 511 java_lang_Class::set_fixup_mirror_list(NULL); 512 } 513 514 static bool has_run_finalizers_on_exit = false; 515 516 void Universe::run_finalizers_on_exit() { 517 if (has_run_finalizers_on_exit) return; 518 has_run_finalizers_on_exit = true; 519 520 // Called on VM exit. This ought to be run in a separate thread. 521 if (TraceReferenceGC) tty->print_cr("Callback to run finalizers on exit"); 522 { 523 PRESERVE_EXCEPTION_MARK; 524 KlassHandle finalizer_klass(THREAD, SystemDictionary::Finalizer_klass()); 525 JavaValue result(T_VOID); 526 JavaCalls::call_static( 527 &result, 528 finalizer_klass, 529 vmSymbols::run_finalizers_on_exit_name(), 530 vmSymbols::void_method_signature(), 531 THREAD 532 ); 533 // Ignore any pending exceptions 534 CLEAR_PENDING_EXCEPTION; 535 } 536 } 537 538 539 // initialize_vtable could cause gc if 540 // 1) we specified true to initialize_vtable and 541 // 2) this ran after gc was enabled 542 // In case those ever change we use handles for oops 543 void Universe::reinitialize_vtable_of(KlassHandle k_h, TRAPS) { 544 // init vtable of k and all subclasses 545 Klass* ko = k_h(); 546 klassVtable* vt = ko->vtable(); 547 if (vt) vt->initialize_vtable(false, CHECK); 548 if (ko->oop_is_instance()) { 549 InstanceKlass* ik = (InstanceKlass*)ko; 550 for (KlassHandle s_h(THREAD, ik->subklass()); 551 s_h() != NULL; 552 s_h = KlassHandle(THREAD, s_h()->next_sibling())) { 553 reinitialize_vtable_of(s_h, CHECK); 554 } 555 } 556 } 557 558 559 void initialize_itable_for_klass(Klass* k, TRAPS) { 560 InstanceKlass::cast(k)->itable()->initialize_itable(false, CHECK); 561 } 562 563 564 void Universe::reinitialize_itables(TRAPS) { 565 SystemDictionary::classes_do(initialize_itable_for_klass, CHECK); 566 567 } 568 569 570 bool Universe::on_page_boundary(void* addr) { 571 return ((uintptr_t) addr) % os::vm_page_size() == 0; 572 } 573 574 575 bool Universe::should_fill_in_stack_trace(Handle throwable) { 576 // never attempt to fill in the stack trace of preallocated errors that do not have 577 // backtrace. These errors are kept alive forever and may be "re-used" when all 578 // preallocated errors with backtrace have been consumed. Also need to avoid 579 // a potential loop which could happen if an out of memory occurs when attempting 580 // to allocate the backtrace. 581 return ((throwable() != Universe::_out_of_memory_error_java_heap) && 582 (throwable() != Universe::_out_of_memory_error_metaspace) && 583 (throwable() != Universe::_out_of_memory_error_class_metaspace) && 584 (throwable() != Universe::_out_of_memory_error_array_size) && 585 (throwable() != Universe::_out_of_memory_error_gc_overhead_limit) && 586 (throwable() != Universe::_out_of_memory_error_realloc_objects)); 587 } 588 589 590 oop Universe::gen_out_of_memory_error(oop default_err) { 591 // generate an out of memory error: 592 // - if there is a preallocated error with backtrace available then return it wth 593 // a filled in stack trace. 594 // - if there are no preallocated errors with backtrace available then return 595 // an error without backtrace. 596 int next; 597 if (_preallocated_out_of_memory_error_avail_count > 0) { 598 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count); 599 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt"); 600 } else { 601 next = -1; 602 } 603 if (next < 0) { 604 // all preallocated errors have been used. 605 // return default 606 return default_err; 607 } else { 608 // get the error object at the slot and set set it to NULL so that the 609 // array isn't keeping it alive anymore. 610 oop exc = preallocated_out_of_memory_errors()->obj_at(next); 611 assert(exc != NULL, "slot has been used already"); 612 preallocated_out_of_memory_errors()->obj_at_put(next, NULL); 613 614 // use the message from the default error 615 oop msg = java_lang_Throwable::message(default_err); 616 assert(msg != NULL, "no message"); 617 java_lang_Throwable::set_message(exc, msg); 618 619 // populate the stack trace and return it. 620 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc); 621 return exc; 622 } 623 } 624 625 intptr_t Universe::_non_oop_bits = 0; 626 627 void* Universe::non_oop_word() { 628 // Neither the high bits nor the low bits of this value is allowed 629 // to look like (respectively) the high or low bits of a real oop. 630 // 631 // High and low are CPU-specific notions, but low always includes 632 // the low-order bit. Since oops are always aligned at least mod 4, 633 // setting the low-order bit will ensure that the low half of the 634 // word will never look like that of a real oop. 635 // 636 // Using the OS-supplied non-memory-address word (usually 0 or -1) 637 // will take care of the high bits, however many there are. 638 639 if (_non_oop_bits == 0) { 640 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1; 641 } 642 643 return (void*)_non_oop_bits; 644 } 645 646 jint universe_init() { 647 assert(!Universe::_fully_initialized, "called after initialize_vtables"); 648 guarantee(1 << LogHeapWordSize == sizeof(HeapWord), 649 "LogHeapWordSize is incorrect."); 650 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?"); 651 guarantee(sizeof(oop) % sizeof(HeapWord) == 0, 652 "oop size is not not a multiple of HeapWord size"); 653 TraceTime timer("Genesis", TraceStartupTime); 654 JavaClasses::compute_hard_coded_offsets(); 655 656 jint status = Universe::initialize_heap(); 657 if (status != JNI_OK) { 658 return status; 659 } 660 661 Metaspace::global_initialize(); 662 663 // Checks 'AfterMemoryInit' constraints. 664 if (!CommandLineFlagConstraintList::check_constraints(CommandLineFlagConstraint::AfterMemoryInit)) { 665 return JNI_EINVAL; 666 } 667 668 // Create memory for metadata. Must be after initializing heap for 669 // DumpSharedSpaces. 670 ClassLoaderData::init_null_class_loader_data(); 671 672 // We have a heap so create the Method* caches before 673 // Metaspace::initialize_shared_spaces() tries to populate them. 674 Universe::_finalizer_register_cache = new LatestMethodCache(); 675 Universe::_loader_addClass_cache = new LatestMethodCache(); 676 Universe::_pd_implies_cache = new LatestMethodCache(); 677 Universe::_throw_illegal_access_error_cache = new LatestMethodCache(); 678 679 if (UseSharedSpaces) { 680 // Read the data structures supporting the shared spaces (shared 681 // system dictionary, symbol table, etc.). After that, access to 682 // the file (other than the mapped regions) is no longer needed, and 683 // the file is closed. Closing the file does not affect the 684 // currently mapped regions. 685 MetaspaceShared::initialize_shared_spaces(); 686 StringTable::create_table(); 687 } else { 688 SymbolTable::create_table(); 689 StringTable::create_table(); 690 ClassLoader::create_package_info_table(); 691 692 if (DumpSharedSpaces) { 693 MetaspaceShared::prepare_for_dumping(); 694 } 695 } 696 697 return JNI_OK; 698 } 699 700 CollectedHeap* Universe::create_heap() { 701 assert(_collectedHeap == NULL, "Heap already created"); 702 #if !INCLUDE_ALL_GCS 703 if (UseParallelGC) { 704 fatal("UseParallelGC not supported in this VM."); 705 } else if (UseG1GC) { 706 fatal("UseG1GC not supported in this VM."); 707 } else if (UseConcMarkSweepGC) { 708 fatal("UseConcMarkSweepGC not supported in this VM."); 709 #else 710 if (UseParallelGC) { 711 return Universe::create_heap_with_policy<ParallelScavengeHeap, GenerationSizer>(); 712 } else if (UseG1GC) { 713 return Universe::create_heap_with_policy<G1CollectedHeap, G1CollectorPolicy>(); 714 } else if (UseConcMarkSweepGC) { 715 return Universe::create_heap_with_policy<GenCollectedHeap, ConcurrentMarkSweepPolicy>(); 716 #endif 717 } else if (UseSerialGC) { 718 return Universe::create_heap_with_policy<GenCollectedHeap, MarkSweepPolicy>(); 719 } 720 721 ShouldNotReachHere(); 722 return NULL; 723 } 724 725 // Choose the heap base address and oop encoding mode 726 // when compressed oops are used: 727 // Unscaled - Use 32-bits oops without encoding when 728 // NarrowOopHeapBaseMin + heap_size < 4Gb 729 // ZeroBased - Use zero based compressed oops with encoding when 730 // NarrowOopHeapBaseMin + heap_size < 32Gb 731 // HeapBased - Use compressed oops with heap base + encoding. 732 733 jint Universe::initialize_heap() { 734 jint status = JNI_ERR; 735 736 _collectedHeap = create_heap_ext(); 737 if (_collectedHeap == NULL) { 738 _collectedHeap = create_heap(); 739 } 740 741 status = _collectedHeap->initialize(); 742 if (status != JNI_OK) { 743 return status; 744 } 745 746 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size()); 747 748 #ifdef _LP64 749 if (UseCompressedOops) { 750 // Subtract a page because something can get allocated at heap base. 751 // This also makes implicit null checking work, because the 752 // memory+1 page below heap_base needs to cause a signal. 753 // See needs_explicit_null_check. 754 // Only set the heap base for compressed oops because it indicates 755 // compressed oops for pstack code. 756 if ((uint64_t)Universe::heap()->reserved_region().end() > UnscaledOopHeapMax) { 757 // Didn't reserve heap below 4Gb. Must shift. 758 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 759 } 760 if ((uint64_t)Universe::heap()->reserved_region().end() <= OopEncodingHeapMax) { 761 // Did reserve heap below 32Gb. Can use base == 0; 762 Universe::set_narrow_oop_base(0); 763 } 764 765 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base()); 766 767 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) { 768 Universe::print_compressed_oops_mode(tty); 769 } 770 771 // Tell tests in which mode we run. 772 Arguments::PropertyList_add(new SystemProperty("java.vm.compressedOopsMode", 773 narrow_oop_mode_to_string(narrow_oop_mode()), 774 false)); 775 } 776 // Universe::narrow_oop_base() is one page below the heap. 777 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() - 778 os::vm_page_size()) || 779 Universe::narrow_oop_base() == NULL, "invalid value"); 780 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes || 781 Universe::narrow_oop_shift() == 0, "invalid value"); 782 #endif 783 784 // We will never reach the CATCH below since Exceptions::_throw will cause 785 // the VM to exit if an exception is thrown during initialization 786 787 if (UseTLAB) { 788 assert(Universe::heap()->supports_tlab_allocation(), 789 "Should support thread-local allocation buffers"); 790 ThreadLocalAllocBuffer::startup_initialization(); 791 } 792 return JNI_OK; 793 } 794 795 void Universe::print_compressed_oops_mode(outputStream* st) { 796 st->print("heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB", 797 p2i(Universe::heap()->base()), Universe::heap()->reserved_region().byte_size()/M); 798 799 st->print(", Compressed Oops mode: %s", narrow_oop_mode_to_string(narrow_oop_mode())); 800 801 if (Universe::narrow_oop_base() != 0) { 802 st->print(": " PTR_FORMAT, p2i(Universe::narrow_oop_base())); 803 } 804 805 if (Universe::narrow_oop_shift() != 0) { 806 st->print(", Oop shift amount: %d", Universe::narrow_oop_shift()); 807 } 808 809 if (!Universe::narrow_oop_use_implicit_null_checks()) { 810 st->print(", no protected page in front of the heap"); 811 } 812 st->cr(); 813 } 814 815 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) { 816 817 assert(alignment <= Arguments::conservative_max_heap_alignment(), 818 "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT, 819 alignment, Arguments::conservative_max_heap_alignment()); 820 821 size_t total_reserved = align_size_up(heap_size, alignment); 822 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())), 823 "heap size is too big for compressed oops"); 824 825 bool use_large_pages = UseLargePages && is_size_aligned(alignment, os::large_page_size()); 826 assert(!UseLargePages 827 || UseParallelGC 828 || use_large_pages, "Wrong alignment to use large pages"); 829 830 // Now create the space. 831 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages); 832 833 if (total_rs.is_reserved()) { 834 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0), 835 "must be exactly of required size and alignment"); 836 // We are good. 837 838 if (UseCompressedOops) { 839 // Universe::initialize_heap() will reset this to NULL if unscaled 840 // or zero-based narrow oops are actually used. 841 // Else heap start and base MUST differ, so that NULL can be encoded nonambigous. 842 Universe::set_narrow_oop_base((address)total_rs.compressed_oop_base()); 843 } 844 845 return total_rs; 846 } 847 848 vm_exit_during_initialization( 849 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap", 850 total_reserved/K)); 851 852 // satisfy compiler 853 ShouldNotReachHere(); 854 return ReservedHeapSpace(0, 0, false); 855 } 856 857 858 // It's the caller's responsibility to ensure glitch-freedom 859 // (if required). 860 void Universe::update_heap_info_at_gc() { 861 _heap_capacity_at_last_gc = heap()->capacity(); 862 _heap_used_at_last_gc = heap()->used(); 863 } 864 865 866 const char* Universe::narrow_oop_mode_to_string(Universe::NARROW_OOP_MODE mode) { 867 switch (mode) { 868 case UnscaledNarrowOop: 869 return "32-bit"; 870 case ZeroBasedNarrowOop: 871 return "Zero based"; 872 case DisjointBaseNarrowOop: 873 return "Non-zero disjoint base"; 874 case HeapBasedNarrowOop: 875 return "Non-zero based"; 876 } 877 878 ShouldNotReachHere(); 879 return ""; 880 } 881 882 883 Universe::NARROW_OOP_MODE Universe::narrow_oop_mode() { 884 if (narrow_oop_base_disjoint()) { 885 return DisjointBaseNarrowOop; 886 } 887 888 if (narrow_oop_base() != 0) { 889 return HeapBasedNarrowOop; 890 } 891 892 if (narrow_oop_shift() != 0) { 893 return ZeroBasedNarrowOop; 894 } 895 896 return UnscaledNarrowOop; 897 } 898 899 900 void universe2_init() { 901 EXCEPTION_MARK; 902 Universe::genesis(CATCH); 903 } 904 905 906 bool universe_post_init() { 907 assert(!is_init_completed(), "Error: initialization not yet completed!"); 908 Universe::_fully_initialized = true; 909 EXCEPTION_MARK; 910 { ResourceMark rm; 911 Interpreter::initialize(); // needed for interpreter entry points 912 if (!UseSharedSpaces) { 913 HandleMark hm(THREAD); 914 KlassHandle ok_h(THREAD, SystemDictionary::Object_klass()); 915 Universe::reinitialize_vtable_of(ok_h, CHECK_false); 916 Universe::reinitialize_itables(CHECK_false); 917 } 918 } 919 920 HandleMark hm(THREAD); 921 Klass* k; 922 instanceKlassHandle k_h; 923 // Setup preallocated empty java.lang.Class array 924 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false); 925 926 // Setup preallocated OutOfMemoryError errors 927 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false); 928 k_h = instanceKlassHandle(THREAD, k); 929 Universe::_out_of_memory_error_java_heap = k_h->allocate_instance(CHECK_false); 930 Universe::_out_of_memory_error_metaspace = k_h->allocate_instance(CHECK_false); 931 Universe::_out_of_memory_error_class_metaspace = k_h->allocate_instance(CHECK_false); 932 Universe::_out_of_memory_error_array_size = k_h->allocate_instance(CHECK_false); 933 Universe::_out_of_memory_error_gc_overhead_limit = 934 k_h->allocate_instance(CHECK_false); 935 Universe::_out_of_memory_error_realloc_objects = k_h->allocate_instance(CHECK_false); 936 937 // Setup preallocated NullPointerException 938 // (this is currently used for a cheap & dirty solution in compiler exception handling) 939 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false); 940 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 941 // Setup preallocated ArithmeticException 942 // (this is currently used for a cheap & dirty solution in compiler exception handling) 943 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false); 944 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 945 // Virtual Machine Error for when we get into a situation we can't resolve 946 k = SystemDictionary::resolve_or_fail( 947 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false); 948 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false); 949 if (!linked) { 950 tty->print_cr("Unable to link/verify VirtualMachineError class"); 951 return false; // initialization failed 952 } 953 Universe::_virtual_machine_error_instance = 954 InstanceKlass::cast(k)->allocate_instance(CHECK_false); 955 956 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 957 958 if (!DumpSharedSpaces) { 959 // These are the only Java fields that are currently set during shared space dumping. 960 // We prefer to not handle this generally, so we always reinitialize these detail messages. 961 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false); 962 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg()); 963 964 msg = java_lang_String::create_from_str("Metaspace", CHECK_false); 965 java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg()); 966 msg = java_lang_String::create_from_str("Compressed class space", CHECK_false); 967 java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg()); 968 969 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false); 970 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg()); 971 972 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false); 973 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg()); 974 975 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK_false); 976 java_lang_Throwable::set_message(Universe::_out_of_memory_error_realloc_objects, msg()); 977 978 msg = java_lang_String::create_from_str("/ by zero", CHECK_false); 979 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg()); 980 981 // Setup the array of errors that have preallocated backtrace 982 k = Universe::_out_of_memory_error_java_heap->klass(); 983 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error"); 984 k_h = instanceKlassHandle(THREAD, k); 985 986 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0; 987 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(k_h(), len, CHECK_false); 988 for (int i=0; i<len; i++) { 989 oop err = k_h->allocate_instance(CHECK_false); 990 Handle err_h = Handle(THREAD, err); 991 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false); 992 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h()); 993 } 994 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len; 995 } 996 997 998 // Setup static method for registering finalizers 999 // The finalizer klass must be linked before looking up the method, in 1000 // case it needs to get rewritten. 1001 InstanceKlass::cast(SystemDictionary::Finalizer_klass())->link_class(CHECK_false); 1002 Method* m = InstanceKlass::cast(SystemDictionary::Finalizer_klass())->find_method( 1003 vmSymbols::register_method_name(), 1004 vmSymbols::register_method_signature()); 1005 if (m == NULL || !m->is_static()) { 1006 tty->print_cr("Unable to link/verify Finalizer.register method"); 1007 return false; // initialization failed (cannot throw exception yet) 1008 } 1009 Universe::_finalizer_register_cache->init( 1010 SystemDictionary::Finalizer_klass(), m); 1011 1012 InstanceKlass::cast(SystemDictionary::misc_Unsafe_klass())->link_class(CHECK_false); 1013 m = InstanceKlass::cast(SystemDictionary::misc_Unsafe_klass())->find_method( 1014 vmSymbols::throwIllegalAccessError_name(), 1015 vmSymbols::void_method_signature()); 1016 if (m != NULL && !m->is_static()) { 1017 // Note null is okay; this method is used in itables, and if it is null, 1018 // then AbstractMethodError is thrown instead. 1019 tty->print_cr("Unable to link/verify Unsafe.throwIllegalAccessError method"); 1020 return false; // initialization failed (cannot throw exception yet) 1021 } 1022 Universe::_throw_illegal_access_error_cache->init( 1023 SystemDictionary::misc_Unsafe_klass(), m); 1024 1025 // Setup method for registering loaded classes in class loader vector 1026 InstanceKlass::cast(SystemDictionary::ClassLoader_klass())->link_class(CHECK_false); 1027 m = InstanceKlass::cast(SystemDictionary::ClassLoader_klass())->find_method(vmSymbols::addClass_name(), vmSymbols::class_void_signature()); 1028 if (m == NULL || m->is_static()) { 1029 tty->print_cr("Unable to link/verify ClassLoader.addClass method"); 1030 return false; // initialization failed (cannot throw exception yet) 1031 } 1032 Universe::_loader_addClass_cache->init( 1033 SystemDictionary::ClassLoader_klass(), m); 1034 1035 // Setup method for checking protection domain 1036 InstanceKlass::cast(SystemDictionary::ProtectionDomain_klass())->link_class(CHECK_false); 1037 m = InstanceKlass::cast(SystemDictionary::ProtectionDomain_klass())-> 1038 find_method(vmSymbols::impliesCreateAccessControlContext_name(), 1039 vmSymbols::void_boolean_signature()); 1040 // Allow NULL which should only happen with bootstrapping. 1041 if (m != NULL) { 1042 if (m->is_static()) { 1043 // NoSuchMethodException doesn't actually work because it tries to run the 1044 // <init> function before java_lang_Class is linked. Print error and exit. 1045 tty->print_cr("ProtectionDomain.impliesCreateAccessControlContext() has the wrong linkage"); 1046 return false; // initialization failed 1047 } 1048 Universe::_pd_implies_cache->init( 1049 SystemDictionary::ProtectionDomain_klass(), m); 1050 } 1051 1052 // This needs to be done before the first scavenge/gc, since 1053 // it's an input to soft ref clearing policy. 1054 { 1055 MutexLocker x(Heap_lock); 1056 Universe::update_heap_info_at_gc(); 1057 } 1058 1059 // ("weak") refs processing infrastructure initialization 1060 Universe::heap()->post_initialize(); 1061 1062 // Initialize performance counters for metaspaces 1063 MetaspaceCounters::initialize_performance_counters(); 1064 CompressedClassSpaceCounters::initialize_performance_counters(); 1065 1066 MemoryService::add_metaspace_memory_pools(); 1067 1068 MemoryService::set_universe_heap(Universe::heap()); 1069 #if INCLUDE_CDS 1070 SharedClassUtil::initialize(CHECK_false); 1071 #endif 1072 return true; 1073 } 1074 1075 1076 void Universe::compute_base_vtable_size() { 1077 _base_vtable_size = ClassLoader::compute_Object_vtable(); 1078 } 1079 1080 1081 void Universe::print() { 1082 print_on(gclog_or_tty); 1083 } 1084 1085 void Universe::print_on(outputStream* st, bool extended) { 1086 st->print_cr("Heap"); 1087 if (!extended) { 1088 heap()->print_on(st); 1089 } else { 1090 heap()->print_extended_on(st); 1091 } 1092 } 1093 1094 void Universe::print_heap_at_SIGBREAK() { 1095 if (PrintHeapAtSIGBREAK) { 1096 MutexLocker hl(Heap_lock); 1097 print_on(tty); 1098 tty->cr(); 1099 tty->flush(); 1100 } 1101 } 1102 1103 void Universe::print_heap_before_gc(outputStream* st, bool ignore_extended) { 1104 st->print_cr("{Heap before GC invocations=%u (full %u):", 1105 heap()->total_collections(), 1106 heap()->total_full_collections()); 1107 if (!PrintHeapAtGCExtended || ignore_extended) { 1108 heap()->print_on(st); 1109 } else { 1110 heap()->print_extended_on(st); 1111 } 1112 } 1113 1114 void Universe::print_heap_after_gc(outputStream* st, bool ignore_extended) { 1115 st->print_cr("Heap after GC invocations=%u (full %u):", 1116 heap()->total_collections(), 1117 heap()->total_full_collections()); 1118 if (!PrintHeapAtGCExtended || ignore_extended) { 1119 heap()->print_on(st); 1120 } else { 1121 heap()->print_extended_on(st); 1122 } 1123 st->print_cr("}"); 1124 } 1125 1126 void Universe::verify(VerifyOption option, const char* prefix, bool silent) { 1127 // The use of _verify_in_progress is a temporary work around for 1128 // 6320749. Don't bother with a creating a class to set and clear 1129 // it since it is only used in this method and the control flow is 1130 // straight forward. 1131 _verify_in_progress = true; 1132 1133 COMPILER2_PRESENT( 1134 assert(!DerivedPointerTable::is_active(), 1135 "DPT should not be active during verification " 1136 "(of thread stacks below)"); 1137 ) 1138 1139 ResourceMark rm; 1140 HandleMark hm; // Handles created during verification can be zapped 1141 _verify_count++; 1142 1143 if (!silent) gclog_or_tty->print("%s", prefix); 1144 if (!silent) gclog_or_tty->print("[Verifying "); 1145 if (!silent) gclog_or_tty->print("threads "); 1146 Threads::verify(); 1147 if (!silent) gclog_or_tty->print("heap "); 1148 heap()->verify(silent, option); 1149 if (!silent) gclog_or_tty->print("syms "); 1150 SymbolTable::verify(); 1151 if (!silent) gclog_or_tty->print("strs "); 1152 StringTable::verify(); 1153 { 1154 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1155 if (!silent) gclog_or_tty->print("zone "); 1156 CodeCache::verify(); 1157 } 1158 if (!silent) gclog_or_tty->print("dict "); 1159 SystemDictionary::verify(); 1160 #ifndef PRODUCT 1161 if (!silent) gclog_or_tty->print("cldg "); 1162 ClassLoaderDataGraph::verify(); 1163 #endif 1164 if (!silent) gclog_or_tty->print("metaspace chunks "); 1165 MetaspaceAux::verify_free_chunks(); 1166 if (!silent) gclog_or_tty->print("hand "); 1167 JNIHandles::verify(); 1168 if (!silent) gclog_or_tty->print("C-heap "); 1169 os::check_heap(); 1170 if (!silent) gclog_or_tty->print("code cache "); 1171 CodeCache::verify_oops(); 1172 if (!silent) gclog_or_tty->print_cr("]"); 1173 1174 _verify_in_progress = false; 1175 } 1176 1177 1178 #ifndef PRODUCT 1179 void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) { 1180 assert(low_boundary < high_boundary, "bad interval"); 1181 1182 // decide which low-order bits we require to be clear: 1183 size_t alignSize = MinObjAlignmentInBytes; 1184 size_t min_object_size = CollectedHeap::min_fill_size(); 1185 1186 // make an inclusive limit: 1187 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; 1188 uintptr_t min = (uintptr_t)low_boundary; 1189 assert(min < max, "bad interval"); 1190 uintptr_t diff = max ^ min; 1191 1192 // throw away enough low-order bits to make the diff vanish 1193 uintptr_t mask = (uintptr_t)(-1); 1194 while ((mask & diff) != 0) 1195 mask <<= 1; 1196 uintptr_t bits = (min & mask); 1197 assert(bits == (max & mask), "correct mask"); 1198 // check an intermediate value between min and max, just to make sure: 1199 assert(bits == ((min + (max-min)/2) & mask), "correct mask"); 1200 1201 // require address alignment, too: 1202 mask |= (alignSize - 1); 1203 1204 if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) { 1205 assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability"); 1206 } 1207 _verify_oop_mask = mask; 1208 _verify_oop_bits = bits; 1209 } 1210 1211 // Oop verification (see MacroAssembler::verify_oop) 1212 1213 uintptr_t Universe::verify_oop_mask() { 1214 MemRegion m = heap()->reserved_region(); 1215 calculate_verify_data(m.start(), m.end()); 1216 return _verify_oop_mask; 1217 } 1218 1219 uintptr_t Universe::verify_oop_bits() { 1220 MemRegion m = heap()->reserved_region(); 1221 calculate_verify_data(m.start(), m.end()); 1222 return _verify_oop_bits; 1223 } 1224 1225 uintptr_t Universe::verify_mark_mask() { 1226 return markOopDesc::lock_mask_in_place; 1227 } 1228 1229 uintptr_t Universe::verify_mark_bits() { 1230 intptr_t mask = verify_mark_mask(); 1231 intptr_t bits = (intptr_t)markOopDesc::prototype(); 1232 assert((bits & ~mask) == 0, "no stray header bits"); 1233 return bits; 1234 } 1235 #endif // PRODUCT 1236 1237 1238 void Universe::compute_verify_oop_data() { 1239 verify_oop_mask(); 1240 verify_oop_bits(); 1241 verify_mark_mask(); 1242 verify_mark_bits(); 1243 } 1244 1245 1246 void LatestMethodCache::init(Klass* k, Method* m) { 1247 if (!UseSharedSpaces) { 1248 _klass = k; 1249 } 1250 #ifndef PRODUCT 1251 else { 1252 // sharing initilization should have already set up _klass 1253 assert(_klass != NULL, "just checking"); 1254 } 1255 #endif 1256 1257 _method_idnum = m->method_idnum(); 1258 assert(_method_idnum >= 0, "sanity check"); 1259 } 1260 1261 1262 Method* LatestMethodCache::get_method() { 1263 if (klass() == NULL) return NULL; 1264 InstanceKlass* ik = InstanceKlass::cast(klass()); 1265 Method* m = ik->method_with_idnum(method_idnum()); 1266 assert(m != NULL, "sanity check"); 1267 return m; 1268 } 1269 1270 1271 #ifdef ASSERT 1272 // Release dummy object(s) at bottom of heap 1273 bool Universe::release_fullgc_alot_dummy() { 1274 MutexLocker ml(FullGCALot_lock); 1275 if (_fullgc_alot_dummy_array != NULL) { 1276 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) { 1277 // No more dummies to release, release entire array instead 1278 _fullgc_alot_dummy_array = NULL; 1279 return false; 1280 } 1281 if (!UseConcMarkSweepGC) { 1282 // Release dummy at bottom of old generation 1283 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1284 } 1285 // Release dummy at bottom of permanent generation 1286 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1287 } 1288 return true; 1289 } 1290 1291 #endif // ASSERT